How to split any string with text as keyword

[Swarit_Goyal1 (Swarit Goyal)]

I am not not abel to apply regex to check the text on next lines

[Shubham_Kinge]

@Swarit_Goyal1

urrently Unreviewed
Service Dates 5/4/2023
Last Name DISHMAN Owner: Me (Jorie, Bot20)
First Name WILLIAM
Follow-up Status: Financial Counseling/Self Pay
Middle Name/Init L Front Desk
POS Collection
Member ID
DOB
JEA013073630
2/19/1973
Follow-up Date:
mm/dd/yyyy

Just provide
“\d{1,2}/\d{1,2}/\d{4}(?!Follow-up)”
and put advance.not literal
Then also if its not solved then use text as single line using
yourtext = YourMultilineText.Replace(Environment.NewLine, " ") and then provide regex